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Model 121 Div 2 Hazardous Locations

"Piston Type"

 Differential Pressure Switch / Transmitter
Electrical Configurations E, F & W
Class l, Division 2, Groups A, B, C & D
Class ll, Division 2, Groups F & G

Certifications:

  • CSA Certified to Canadian and US Standards

Dimensions:       

 See 121_dimension_haz_loc

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Product Features/Benefits

  • Indication and Pressure Containing Element design identical to Standard product
  • Lower Cost when Compared to Explosion-proof designs
  • Similar to 120 Division 2 product Except with Field Wireable Terminal Strip (Separate Junction Box not required)
  • CSA Listed to Canadian and US Standard (Switch and transmitter)
  • Ranges, Scales, Dial Sizes, Ports, Elastomers etc. available are equivalent to Non-Hazardous Location product
  • Hermetically Sealed Switch Design
    Seal not required
  • Aluminum Weatherproof NEMA 4X Electrical Enclosure with 1/2" FNPT Conduit entry
  • No Input Power required to operate the switches; Transmitter requires 8-28 Vdc Loop Power
  • For complete model details See BULLETIN_121
  • Installation and Operation Manual (Refer to Hazardous Locations section. Electrical Configurations E, F, or W) ELECIOM_121

Specifications / Configuration

Electrical Specifications:

See Bulletin:  Specificationsheet_121     Refer to  Electrical  Configurations E & F, & W

Switch Electrical Specifications: See Bulletin: ELECIOM_121

Mid-West Hazardous Locations Indicating / Non-indicating  switch (Electrical Configurations E or F) is intended for use in Division 2 hazardous Locations.

  • 1 or 2 Independently adjustable SPST or SPDT Switches
  • Weather-proof  NEMA 4X Rated enclosure with ½”FNPT Conduit
  • Field Wireable Terminal Strip – Wire range 22Awg to 16 Awg
Parameter SPST (Normally Open) (Normally Closed) SPDT
Option E, F, G A
*Power 60 Watt 3 Watt
Maximum Current 3.0 Amps 0.25 Amps
Maximum Voltage 240 VAC/VDC 125 VAC/VDC
Switch Setting
%Full Scale		 20 to 95 15 to 95
Hysteresis
Maximum/Nominal		 18% / 10%
Full Scale		 12% / 8%
Repeatability 1% Full Scale 1% Full Scale

*  Product of the switching Voltage and Current Shall not exceed the Power Rating.

Transmitter Specifications: See Bulletin: ELECIOM_121 (Electrical Configuration W)Transmitter Configuration “W”, Model 121 Transmitter is intended for use in Division 2 locations . The Model 121 indicating / non-indicating differential pressure transmitter is a 2 wire loop powered microprocessor based 4-20 ma transmitter. The magnetic angle sensor & electronics senses the angle (relative to the transmitter sensor) of the magnet which moves linearly in the bore. Each transmitter is individually calibrated to the gauge using an 11 point calibration linearization technique. This method results in a <2% full scale accuracy for the upper 80% of the range.

  • 4-20mA Loop Powered Micro Processor based Transmitter
  • 4 Position Terminal Strip 22 AWG – 16 AWG
  • 8-28 VDC Loop Powered 2-wire interface
  • 1000 Ohm max loop resistance at 28 Vdc.
  • ±2% Accuracy from 20% to 100% of scale, ascending
  • Indicator operation is isolated from Loop Power
  • Weather-proof  NEMA 4X Rated enclosure with ½”FNPT Conduit

Additional Options:

  • Pipe Mounting kit - 2" U-Bolt
  • Wall Mounting (not available with back connections)
  • Liquid Fill
  • Maximum Indicator Follower Pointer

The Mid-West Advantage

Model 121 Div 2 Hazardous LocationsDocuments

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“Piston Type” Hazardous Locations Product

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 120 0-5 PSID to 0-110 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Flying Leads / DIN Connector, Class 1-Div. 1, Class 1-Div. 2
Model 121 0-5 PSID to 0-100 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X,Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 220 0-5 PSID to 0-100 PSID ±3/2/3% Up to 4,000 PSI CE / ATEX / RoHS Compliant, KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A

“Diaphragm Type” Hazardous Locations Product

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 130 0-5" H2O to 0-15 PSID (0-400" H2O) 0-5" H2O to 0-9.9" H2O
±5%
0-10" H2O to 0-15 PSID
±3/2/3%		 Up to 500 PSI CE / LVD, RoHS Compliant, NEMA 4X, Class 1-Div. 1
Model 140 0-50" H2O to 0-100 PSID 0-50" H2O to 0-399" H2O
±5%
0-15 PSID to 0-100 PSID
±3/2/3%		 Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 142 0-20" H2O to 0-25 PSID ±3/2/3% Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter
Model 240 0-20" H2O to 0-100 PSID ±3/2/3% Up to 1500 PSI CE / ATEX / RoHS Compliant CSA, UL & KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A